package com.rx.mgt.util;


import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.format.VerticalAlignment;
import jxl.write.*;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.util.List;

/**
 * Created by zxj on 2017/4/25.
 */
public class PoiExcelUtil {

    public  final static String exportExcel(String fileName, String[] Title, List<Object> listContent, HttpServletResponse response) {
        String result="系统提示：Excel文件导出成功！";
        // 以下开始输出到EXCEL
        try {
            //定义输出流，以便打开保存对话框______________________begin
            OutputStream os = response.getOutputStream();
            response.reset();// 清空输出流
            response.setHeader("Content-disposition", "attachment; filename="+ new String(fileName.getBytes("utf-8"),"ISO-8859-1"));
// 设定输出文件头
            response.setContentType("application/msexcel");// 定义输出类型
            //定义输出流，以便打开保存对话框_______________________end

            /** **********创建工作簿************ */
            WritableWorkbook workbook = Workbook.createWorkbook(os);
           // XSSFWorkbook workbook = new XSSFWorkbook();

            /** **********创建工作表************ */

            WritableSheet sheet = workbook.createSheet("Sheet1", 0);

            /** **********设置纵横打印（默认为纵打）、打印纸***************** */
            jxl.SheetSettings sheetset = sheet.getSettings();
            sheetset.setProtected(false);


            /** ************设置单元格字体************** */
            WritableFont NormalFont = new WritableFont(WritableFont.ARIAL, 10);
            WritableFont BoldFont = new WritableFont(WritableFont.ARIAL, 10,WritableFont.BOLD);

            /** ************以下设置三种单元格样式，灵活备用************ */
            // 用于标题居中
            WritableCellFormat wcf_center = new WritableCellFormat(BoldFont);
            wcf_center.setBorder(Border.ALL, BorderLineStyle.THIN); // 线条
            wcf_center.setVerticalAlignment(VerticalAlignment.CENTRE); // 文字垂直对齐
            wcf_center.setAlignment(Alignment.CENTRE); // 文字水平对齐
            wcf_center.setWrap(false); // 文字是否换行

            // 用于正文居左
            WritableCellFormat wcf_left = new WritableCellFormat(NormalFont);
            wcf_left.setBorder(Border.NONE, BorderLineStyle.THIN); // 线条
            wcf_left.setVerticalAlignment(VerticalAlignment.CENTRE); // 文字垂直对齐
            wcf_left.setAlignment(Alignment.LEFT); // 文字水平对齐
            wcf_left.setWrap(false); // 文字是否换行


            /** ***************以下是EXCEL开头大标题，暂时省略********************* */
            //sheet.mergeCells(0, 0, colWidth, 0);
            //sheet.addCell(new Label(0, 0, "XX报表", wcf_center));
            /** ***************以下是EXCEL第一行列标题********************* */
            for (int i = 0; i < Title.length; i++) {
                sheet.addCell(new Label(i, 0,Title[i],wcf_center));
            }
            /** ***************以下是EXCEL正文数据********************* */
            Field[] fields=null;
            int i=1;
            for(Object obj:listContent){
                fields=obj.getClass().getDeclaredFields();
                int j=0;
                for(Field v:fields){
                    v.setAccessible(true);
                    Object va=v.get(obj);
                    if(va==null){
                        va="";
                    }
                    sheet.addCell(new Label(j, i,va.toString(),wcf_left));
                    j++;
                }
                i++;
            }
            /** **********将以上缓存中的内容写到EXCEL文件中******** */
            workbook.write();
            /** *********关闭文件************* */
            workbook.close();

        } catch (Exception e) {
            result="系统提示：Excel文件导出失败，原因："+ e.toString();
            System.out.println(result);
            e.printStackTrace();
        }
        return result;
    }
}
